Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene - Processing and characterization
Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene - Processing and characterization
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多壁碳纳米管融入聚苯醚/聚苯乙烯的混溶混合物中 - 加工和表征
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发表时间：
2013
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通讯作者：
Joseph von Fraunhofer Strasse
中科院分区：
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作者：
S. Sathyanarayana;M. Wegrzyn;G. Olowojoba;A. Benedito;E. Giménez;C. Hübner;F. Henning;Joseph von Fraunhofer Strasse
在双螺杆挤出机上，以600rpm的螺杆转速，将WT%多壁碳纳米管(MWCNTs)加入到聚苯醚/聚苯乙烯(PPE/PS)共混物中。得到的母粒在400和600rpm下稀释，以获得较低的PPE/PS中的MWCNT负载量。电子显微镜和光学显微镜图像显示，即使在4wt%的高填充量下，MWCNT的分散性也很好，但在较高的螺杆转速下，可以观察到略大的团聚尺寸分数。虽然MWCNT的加入提高了PPE/PS的热稳定性，但与PPE/PS相比，在不同的填料浓度下，复合材料的玻璃化转变略有变化。玻璃化转变时的比热容在2wt%的MWCNT之前显著下降，此后在两种工艺条件下的水平都下降，表明在较低的负荷下增强了填料-基质的相互作用。MWCNT的加入显著提高了纳米复合材料的储能模数，增强效果随温度的变化而显著下降，尤其是在较低填充量时。尽管MWCNT在PPE/PS中具有良好的分散性，但PPE/PS的弹性模量和拉伸强度仅略有提高。当MWCNT含量为0.4wt%时，PPE/PS的电导率比PPE/PS高出近12个数量级。
wt% multiwalled carbon nanotubes (MWCNTs) were incorporated into a miscible blend of polyphenylenether/ polystyrene (PPE/PS) on a twin-screw extruder at a screw speed of 600 rpm. The masterbatch obtained was diluted at 400 and 600 rpm to obtain lower MWCNT loadings in PPE/PS. Electron microscopy & optical microscopy images show very good MWCNT dispersion even at high filler loadings of 4!wt%, but slightly larger agglomerate size fractions are observ- able at higher screw speeds. While MWCNT addition enhanced the thermal stability of PPE/PS, a small change in glass tran- sition was observed on the composites at different filler concentrations compared to PPE/PS. The specific heat capacity at glass transition decreases considerably until 2!wt% MWCNT and levels down thereafter for both processing conditions point- ing to enhanced filler-matrix interaction at lower loadings. Storage modulus of the nanocomposites was enhanced signifi- cantly on MWCNT incorporation with reinforcing effect dropping considerably as a function of temperature, especially at lower filler contents. The modulus and the tensile strength of PPE/PS were only marginally enhanced in spite of excellent MWCNT dispersion in the matrix. Electrical percolation occurs at 0.4!wt% MWCNT content, and the electrical conductiv- ity of 0.5!wt% MWCNT reinforced PPE/PS was close to 12 orders in magnitude higher compared to PPE/PS.